Pitch Gravity Logic

Controls how bubble pitches relate to musical scales, and adds psychoacoustic processing for melodic clarity.

Scale Selection

Control	What It Does
Scale	Choose from 75+ scales including Western modes, world scales, microtonal systems, and experimental tunings. The dropdown shows intervals (e.g., “Major: 2-4-5-7-9-11”).
Root	The root note of the selected scale (C through B).

Quantization

Knob	What It Does
Quantize	How strongly bubble pitches snap to scale notes. At 0%, pitches are free and continuous (raw physics). At 100%, all pitches quantize to the nearest scale degree.

When a scale is selected, incoming MIDI notes are also snapped to the scale before being used to compute bubble pitch — so an arpeggiator or sequencer outputting non-scale notes still produces in-key bubbles.

Snap (Auditory Distortion Products)

Knob	What It Does
Snap	Drives the ADP engine, which spawns psychoacoustic distortion-product partners alongside each main bubble. Low values add subtle spectral richness; high values create dense inharmonic clouds.

The Snap knob is FOAM’s most distinctive sound-shaping control after Rate and Size. It synthesizes auditory distortion products — the same combination tones your ear generates when two close frequencies sound together — and emits them as physical bubbles. The result is content the ear hears as “rougher” or “more present” without literally adding harmonics.

Snap is independent of pitch quantization — you can have free continuous pitches with heavy ADP processing, or perfectly scale-locked melodic mode with no ADP at all.

Enhancers Foam Voicing Dynamics

Getting Started

Interface Guide

Features

Reference

Scale Selection

Quantization

Snap (Auditory Distortion Products)

​Scale Selection

​Quantization

​Snap (Auditory Distortion Products)

Scale Selection

Quantization

Snap (Auditory Distortion Products)